{"id":122586,"date":"2020-12-27T07:55:57","date_gmt":"2020-12-27T07:55:57","guid":{"rendered":"https:\/\/blog.finxter.com\/?p=19606"},"modified":"2020-12-27T07:55:57","modified_gmt":"2020-12-27T07:55:57","slug":"python-getattr","status":"publish","type":"post","link":"https:\/\/sickgaming.net\/blog\/2020\/12\/27\/python-getattr\/","title":{"rendered":"Python getattr()"},"content":{"rendered":"

Python’s built-in getattr(object, string)<\/code> function returns the value of the object<\/code>‘s attribute with name string<\/code>. If this doesn’t exist, it returns the value provided as an optional third default<\/code> argument. If that doesn’t exist either, it raises an AttributeError<\/code>. An example is getattr(porsche, 'speed')<\/code> which is equivalent to porsche.speed<\/code>. <\/p>\n

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\"How<\/figure>\n<\/div>\n

Usage<\/h2>\n

Learn by example! Here’s an example on how to use the getattr()<\/code> built-in function<\/a>.<\/p>\n

# Define class with one attribute\nclass Car: def __init__(self, brand, speed): self.brand = brand self.speed = speed # Create object\nporsche = Car('porsche', 100)\ntesla = Car('tesla', 110) # Two alternatives to get instance attributes:\nprint(getattr(porsche, 'brand') + \" \" + str(getattr(porsche, 'speed')))\nprint(tesla.brand + \" \" + str(tesla.speed)) # Get an attribute that doesn't exist with default argument:\nprint(getattr(porsche, 'color', 'red'))\n<\/pre>\n
The output of this code snippet is:<\/p>\n
porsche 100\ntesla 110\nred<\/pre>\n
Syntax getattr()<\/h2>\n
The getattr()<\/code> object has the following syntax: <\/p>\n
Syntax: <\/strong>\ngetattr(object, attribute[, default])<\/strong> # Get object's attribute value or default if non-existent<\/code><\/pre>\n
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Arguments<\/strong><\/td>\nobject<\/code><\/td>\nThe object from which the attribute value should be drawn.<\/td>\n<\/tr>\n
<\/td>\nattribute<\/code><\/td>\nThe attribute name as a string.<\/td>\n<\/tr>\n
<\/td>\ndefault<\/code><\/td>\nThe return value in case the attribute doesn’t exist.<\/td>\n<\/tr>\n
Return Value<\/strong><\/td>\nobject<\/code><\/td>\nReturns the value of the attribute<\/code> of instance object<\/code> or default<\/code> if non-existent.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n
Video getattr()<\/h2>\n
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